Google started playing with “augmented reality” — I’m using the term here loosely — in the PC version of Street View several months ago, but now appears to be rolling it out more extensively.
Local business listings now appear as small icons connected to their buildings in the Street View image.
Clicking on one brings up an “info window” overlay on the map. Clicking through on the info window to “more info” brings up the Google Place Page:
Bing has a more elaborate version of this with map apps that surface all sorts of content (including tweets and Foursquare “tips”) about a location in a similar fashion, as a layer on the map.
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